Abstracts

THAP065 (Poster)

The Laser Stabilization Controls for the ISAC Beam
Polarizer

R. Nussbaumer, D. Dale, H. Hui, J. Richards, and P. Levy
(TRIUMF)

The ISAC polarized beam facility uses an Argon laser for producing
spin-polarized beams of short-lived radioactive isotopes, initially 7Li. The laser power
and spectral content must be tightly controlled and monitored. The control system to
accomplish this task uses techniques that combine operator interface, data reduction, and
closed loop automation. The laser stabilization application uses input data acquired from
a spectrum analyzer, in the form of a waveform array repetitively acquired from a
GPIB-interfaced oscilloscope. A Labview based operator interface allows the selection of
features from within the waveform, which are then used as the basis for closed loop
control, in concert with the existing EPICS control system software and related hardware.
Part of the challenge stems from using input data which are subject to human
interpretation and require distillation into a hard numeric format suitable for use in a
control system.